Pattern of Rebirth + Mortuary + Boonweaver Giant + Yahenni, Undying Partisan

Pattern of Rebirth

Mortuary

Boonweaver Giant

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Boonweaver Giant.
2. When Boonweaver Giant dies, Mortuary and Pattern of Rebirth trigger.
3. Resolve the Mortuary trigger, putting Boonweaver Giant on the bottom of your library from your graveyard.
4. Resolve the Pattern of Rebirth trigger, putting Boonweaver Giant from your library onto the battlefield.
5. When Boonweaver Giant enters the battlefield, it triggers, returning Pattern of Rebirth from your graveyard to the battlefield attached to Boonweaver Giant.
6. Resolve the Yahenni ability from step 1, giving it indestructible until end of turn.
7. Repeat.

This ingenious loop transforms a single sacrifice into an endless cycle of rebirth by turning your library into a revolving door for your creatures. You kick things off by feeding Boonweaver Giant to Yahenni, Undying Partisan, which immediately triggers both Mortuary and the attached Pattern of Rebirth. Mortuary neatly catches the Giant as it hits the graveyard and tucks it right back into your library, perfectly positioned for Pattern of Rebirth to immediately fish it back out onto the battlefield. Once the Giant returns, its own entry trigger plucks Pattern of Rebirth out of the graveyard to re-enchant it, leaving you ready to feed the Giant to Yahenni all over again for infinite sacrifice, enter-the-battlefield, and death triggers.